feat: add Python example for Kinesis+Lambda (#77)

Author: wulfmann

python/lambda-triggered-by-existing-kinesis-stream/app.py

@@ -0,0 +1,53 @@
+from aws_cdk import (
+    aws_lambda as lambda_,
+    aws_kinesis as kinesis,
+    aws_lambda_event_sources as event_sources,
+    core,
+)
+
+
+class LambdaWithKinesisTrigger(core.Stack):
+    def __init__(self, app: core.App, id: str) -> None:
+        super().__init__(app, id)
+
+        with open("lambda-handler.py", encoding="utf8") as fp:
+            handler_code = fp.read()
+
+        # Creates reference to already existing kinesis stream
+        kinesis_stream = kinesis.Stream.from_stream_arn(
+            self, 'KinesisStream',
+            core.Arn.format(
+                core.ArnComponents(
+                    resource='stream',
+                    service='kinesis',
+                    resource_name='my-stream'
+                ),
+                self
+            )
+        )
+
+        lambdaFn = lambda_.Function(
+            self, 'Singleton',
+            handler='index.main',
+            code=lambda_.InlineCode(handler_code),
+            runtime=lambda_.Runtime.PYTHON_3_7,
+            timeout=core.Duration.seconds(300)
+        )
+        
+        # Update Lambda Permissions To Use Stream
+        kinesis_stream.grant_read(lambdaFn)
+
+        # Create New Kinesis Event Source
+        kinesis_event_source = event_sources.KinesisEventSource(
+            stream=kinesis_stream,
+            starting_position=lambda_.StartingPosition.LATEST,
+            batch_size=1
+        )
+
+        # Attach New Event Source To Lambda
+        lambdaFn.add_event_source(kinesis_event_source)
+
+
+app = core.App()
+LambdaWithKinesisTrigger(app, "LambdaWithKinesisTrigger")
+app.synth()

python/lambda-triggered-by-existing-kinesis-stream/cdk.json

@@ -0,0 +1,3 @@
+{
+    "app": "python3 app.py"
+}

python/lambda-triggered-by-existing-kinesis-stream/lambda-handler.py

@@ -0,0 +1,2 @@
+def main(event, context):
+    print("I'm running!")

python/lambda-triggered-by-existing-kinesis-stream/requirements.txt

@@ -0,0 +1,4 @@
+aws-cdk.aws-kinesis
+aws-cdk.aws-lambda
+aws-cdk-aws-lambda-event-sources
+aws-cdk.core

python/lambda-with-existing-s3-code/app.py

@@ -0,0 +1,32 @@
+from aws_cdk import (
+    aws_lambda as lambda_,
+    aws_s3 as s3,
+    core,
+)
+
+# Creates reference to already existing s3 bucket and lambda code
+
+class LambdaS3Code(core.Stack):
+    def __init__(self, app: core.App, id: str) -> None:
+        super().__init__(app, id)
+
+        lambda_code_bucket = s3.Bucket.from_bucket_attributes(
+            self, 'LambdaCodeBucket',
+            bucket_name='my-lambda-code-bucket'
+        )
+
+        lambdaFn = lambda_.Function(
+            self, 'Singleton',
+            handler='index.main',
+            code=lambda_.S3Code(
+                bucket=lambda_code_bucket,
+                key='my-lambda.py'
+            ),
+            runtime=lambda_.Runtime.PYTHON_3_7,
+            timeout=core.Duration.seconds(300)
+        )
+
+
+app = core.App()
+LambdaS3Code(app, "LambdaS3CodeExample")
+app.synth()

python/lambda-with-existing-s3-code/cdk.json

@@ -0,0 +1,3 @@
+{
+    "app": "python3 app.py"
+}

python/lambda-with-existing-s3-code/requirements.txt

@@ -0,0 +1,3 @@
+aws-cdk.aws-lambda
+aws-cdk.aws-s3
+aws-cdk.core